In my message of Thu, 13 Oct 2011 09:09:54 +0100, I wrote:

>On my machine, the result comes back visibly much faster if the full
>reference is used:
>
>  tell application "System Events"
>    tell process "Safari"
>      value of attribute "AXMenuItemMarkChar" of menu item "Block Pop-up
>Windows" of menu 1 of menu bar item "Safari" of menu bar 1
>    end tell
>  end tell

In fact there _is_ no result if the menu item's not checked. The code
for testing and disabling if necessary would have to be something like:

  tell application "System Events"
    tell process "Safari"
      tell menu item "Block Pop-up Windows" of menu 1 of menu bar item "Safari" of menu bar 1
        if (value of attribute "AXMenuItemMarkChar" exists) then click
      end tell
    end tell
  end tell


NG